- From: Kazuyuki Ashimura <ashimura@w3.org>
- Date: Fri, 18 May 2012 17:15:50 +0900
- To: public-web-and-tv@w3.org
available at:
http://www.w3.org/2012/05/17-webtv-minutes.html
also as text below.
Thanks a lot for taking these minutes, Narm!
Kazuyuki
---
[1]W3C
[1] http://www.w3.org/
- DRAFT -
Media Pipeline Task Force Teleconference
17 May 2012
[2]Agenda
[2] http://www.w3.org/2011/webtv/wiki/MPTF/Agenda_Telco_17th_May_2012
See also: [3]IRC log
[3] http://www.w3.org/2012/05/17-webtv-irc
Attendees
Present
Kazuyuki, Clarke, Glenn, Duncan, Joe, Narm, John,
Niklas, ??P41, +1.908.541.aaee, Kevin, Aaron,
Mark_Watson
Regrets
Chair
Clarke Stevens
Scribe
Narm_Gadiraju
Contents
* [4]Topics
1. [5]Agenda Reivew by Chair
2. [6]video in RTC context
3. [7]WebPerf group from Mark Watson
4. [8]Bug Review
5. [9]Use cases in Content Protection
6. [10]Use Case 2: Support for Commonly-used Container
Formats
7. [11]Use Case 3: Support for a Baseline CDM
8. [12]Use Case 4: Support for Browser-independent
Implementation
9. [13]Use Case 5: Support for Playback of Encrypted
Adaptive Bit-rate Content
* [14]Summary of Action Items
__________________________________________________________
<kaz> agenda:
[15]http://www.w3.org/2011/webtv/wiki/MPTF/Agenda_Telco_17th_Ma
y_2012
[15] http://www.w3.org/2011/webtv/wiki/MPTF/Agenda_Telco_17th_May_2012
Agenda Reivew by Chair
nothing to record
video in RTC context
Clarke: RTC uses some formats for Video and need to confirm
what kind of video we use. Broadcase or Stored?
... should the tags for the Video in RTC be same as what we
have here?
Joe: are there any online resources about RTC
<scribe> ACTION: Clarke send details of RTC WG [recorded in
[16]http://www.w3.org/2012/05/17-webtv-minutes.html#action01]
<trackbot> noticed an ACTION. Trying to create it.
<trackbot> Created ACTION-98 - Send details of RTC WG [on
Clarke Stevens - due 2012-05-24].
Clarke: Clarke is travelling, so no meeting next week.
WebPerf group from Mark Watson
<kaz> [ fyi, LCWD announcement for 2 specs of the group:
[17]https://lists.w3.org/Archives/Member/chairs/2012AprJun/0052
.html ]
[17] https://lists.w3.org/Archives/Member/chairs/2012AprJun/0052.html
<kaz> [ also Navigation Timing CR:
[18]http://www.w3.org/TR/2011/CR-navigation-timing-20110602/ ]
[18] http://www.w3.org/TR/2011/CR-navigation-timing-20110602/
MarkW: For each HTTP request, is the performance information is
provided? Mark checked this with the WebPerf WG
... the intent was to estimate the bandwidth via JavaScript.
... they have an API at the top level window object to get the
performance information at the HTTP level.
... all this can be done via JavaScript
Duncan: Will this work only through JavaScript and no other
method need to be used?
MarkW: Yes. the JavaScript module will directly get the
information from HTTP layer.
MarkW: they dont increase the byte range.
Clarke: You have mentioned that they use a buffer. Does this
create a problem?
MarkW: The buffer is only added when the HTTP request complete.
The estimation can be done in short requests.
Bug Review
Clarke: No change since last week. Any new bugs to report?
Use cases in Content Protection
<Clarke> CP Spec:
[19]http://dvcs.w3.org/hg/webtv/raw-file/tip/mpreq/MPTF-CP-Requ
irements.html
[19]
http://dvcs.w3.org/hg/webtv/raw-file/tip/mpreq/MPTF-CP-Requirements.html
<kaz> especially the [20]Use Cases section
[20]
http://dvcs.w3.org/hg/webtv/raw-file/tip/mpreq/MPTF-CP-Requirements.html#use-cases
Clarke: Reviewing the Use case: Support Authorized Access to
Content
Joe: this is high level and requirements of the use case are
not discussed
Clarke: this is use case and may need more detail. Open to
changes.
John: Authorized Access: focus is on Content Protection, but
authorized access is a separate function. Is there a
requirement for supporting authorization itself?
Clarke: No, a separate requirement is not captured
John: We should have either separate requirement or expand
this.
Bob: Authorization is a saperate requirement
... web cryptography is looking into doing tools for these and
we should co-ordinate.
John: In addition Authorization we should look into Device
Authentication
... this is a requirement for TV devices
... should be able to initiate from a web app.
... even if Authorization and Authentication are not W3C specs,
we should have a way to do it from web app.
Joe: prefer anonymous for authentication. Current spec does not
cover Authentication. User Identification is not covered by
current spec. Not sure if appropriate to put in this use case!
Clarke: Users already have to authenticate. We need to think if
we should formalize this or not ...
Joe: Upto CDM, not sure if we can standardize
Aaron: Authentication may be controversial, because it may make
tracking users easier.
<joesteele> +1
<joesteele> need to be careful about privacy
Bob: The DNT we have to make sure we are doing right.
MarkW: with webcrypto the identity you see via JavaScript is
different from real identity.
Clarke: Summary: This will have to be broken up into multiple
concepts and will work on it.
Use Case 2: Support for Commonly-used Container Formats
Clarke: Reviewing the Use Case 2
Joe: Will there be multiple of these, each for commonly used
container formats?
Clarke: container format is to be defined.
John: your requirement is written as design guideline and may
need rephrasing as a requirement that does not have content
protection markup.
Clarke: The requirement says that content protection does not
favor any specific container format
Use Case 3: Support for a Baseline CDM
Clarke: Reviewing the use case.
Use Case 4: Support for Browser-independent Implementation
Clarke: Reviewing the use case
<kaz> scribenick: kaz
Joe: difference between U3 and U4?
Clarke: you can support U4 without supporting U3
... opinions to express?
Joe: ability to get access the content
... unclear about the player actually play the content
Use Case 5: Support for Playback of Encrypted Adaptive Bit-rate
Content
Clarke: comments?
... out of time
... no call next week
tx for taking notes, narm_gadiraju!
<Clarke> Thanks, Narm
[ adjourned ]
Summary of Action Items
[NEW] ACTION: Clarke send details of RTC WG [recorded in
[21]http://www.w3.org/2012/05/17-webtv-minutes.html#action01]
[End of minutes]
__________________________________________________________
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--
Kaz Ashimura, W3C Staff Contact for Web&TV, MMI and Voice
Tel: +81 466 49 1170
Received on Friday, 18 May 2012 08:17:28 UTC